Jakarta-common-math Use Notes

Apache's math component, although not commonly used, I also sorted it out today.

Download Address: http://commons.apache.org/math/

Sample code:

Package demo;





import Org.apache.commons.math.stat.descriptive.moment.GeometricMean;


import org.apache.commons.math.stat.descriptive.moment.Kurtosis;


import Org.apache.commons.math.stat.descriptive.moment.Mean;


import org.apache.commons.math.stat.descriptive.moment.Skewness;


import org.apache.commons.math.stat.descriptive.moment.StandardDeviation;


import org.apache.commons.math.stat.descriptive.moment.Variance;


import Org.apache.commons.math.stat.descriptive.rank.Max;


import Org.apache.commons.math.stat.descriptive.rank.Min;


import Org.apache.commons.math.stat.descriptive.rank.Percentile;


import org.apache.commons.math.stat.descriptive.summary.Product;


Import Org.apache.commons.math.stat.descriptive.summary.Sum;


import Org.apache.commons.math.stat.descriptive.summary.SumOfSquares;





public class Testmathuserage ... {





public static void Main (string[] args) ... {





double[] values = new double[] ... {0.33, 1.33, 0.27333, 0.3, 0.501,


0.444, 0.44, 0.34496, 0.33, 0.3, 0.292, 0.667};


　　　　 /**//*


* SYSTEM.OUT.PRINTLN ("min:" + statutils.min (values));


* SYSTEM.OUT.PRINTLN ("max:" + Statutils.max (values));


* SYSTEM.OUT.PRINTLN ("mean:" + statutils.mean (values)); Returns


* The arithmetic mean of the entries in the input array, or Double.NaN


* If the array is empty SYSTEM.OUT.PRINTLN ("Product:" +


* STATUTILS.PRODUCT (values)); Returns the product of the entries


* In the input array, or Double.NaN if the array is empty.


* SYSTEM.OUT.PRINTLN ("sum:" + statutils.sum (values)); Returns


* The sum of the values in the input array, or Double.NaN if the array


* is empty. System.out.println ("Variance:" + statutils.variance (


* values)); Returns the variance of the entries in the input


* Array, or Double.NaN if the array is empty.


　　　　 */





min min = new min ();


Max max = new Max ();


Mean Mean = new Mean (); Arithmetic mean value


Product Product = new product ();


sum = new sum ();


Variance Variance = new variance ();


System.out.println ("min:" + min.evaluate (values));


System.out.println ("Max:" + max.evaluate (values));


System.out.println ("mean:" + mean.evaluate (values));


System.out.println ("Product:" + product.evaluate (values));


System.out.println ("sum:" + sum.evaluate (values));


System.out.println ("variance:" + variance.evaluate (values));





percentile percentile = new percentile (); Percentile digit


Geometricmean Geomean = new Geometricmean (); The geometric mean, n-th arithmetic roots of the continuous product of n-positive numbers is called the geometric mean of the number of n


skewness skewness = new skewness (); Skewness ();


kurtosis kurtosis = new Kurtosis (); Kurtosis, Kurtosis


sumofsquares sumofsquares = new Sumofsquares (); Square and


standarddeviation standarddeviation = new Standarddeviation ();


System.out.println ("Percentile value:"


+ percentile.evaluate (values, 80.0));


System.out.println ("Geometric mean:" + geomean.evaluate (values));


System.out.println ("skewness:" + skewness.evaluate (values));


System.out.println ("kurtosis:" + kurtosis.evaluate (values));


System.out.println ("sumofsquares:" + sumofsquares.evaluate (values));


//is the standard variance


System.out.println ("Standarddeviation:"


+ standarddeviation.evaluate (values));


　　 }


}